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Improve DoubleEndedIterator examples #34688

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merged 1 commit into from
Jul 8, 2016
Merged

Improve DoubleEndedIterator examples #34688

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18 changes: 12 additions & 6 deletions src/libcore/iter/traits.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -371,13 +371,16 @@ pub trait Extend<A> {
/// Basic usage:
///
/// ```
/// let numbers = vec![1, 2, 3];
/// let numbers = vec![1, 2, 3, 4, 5, 6];
///
/// let mut iter = numbers.iter();
///
/// assert_eq!(Some(&1), iter.next());
/// assert_eq!(Some(&3), iter.next_back());
/// assert_eq!(Some(&2), iter.next_back());
/// assert_eq!(Some(&6), iter.next_back());
/// assert_eq!(Some(&5), iter.next_back());
/// assert_eq!(Some(&2), iter.next());
/// assert_eq!(Some(&3), iter.next());
/// assert_eq!(Some(&4), iter.next());
/// assert_eq!(None, iter.next());
/// assert_eq!(None, iter.next_back());
/// ```
Expand All @@ -395,13 +398,16 @@ pub trait DoubleEndedIterator: Iterator {
/// Basic usage:
///
/// ```
/// let numbers = vec![1, 2, 3];
/// let numbers = vec![1, 2, 3, 4, 5, 6];
///
/// let mut iter = numbers.iter();
///
/// assert_eq!(Some(&1), iter.next());
/// assert_eq!(Some(&3), iter.next_back());
/// assert_eq!(Some(&2), iter.next_back());
/// assert_eq!(Some(&6), iter.next_back());
/// assert_eq!(Some(&5), iter.next_back());
/// assert_eq!(Some(&2), iter.next());
/// assert_eq!(Some(&3), iter.next());
/// assert_eq!(Some(&4), iter.next());
/// assert_eq!(None, iter.next());
/// assert_eq!(None, iter.next_back());
/// ```
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